@Ianbword 

Well here is the deal.  The Deco 2400 can produce wireless speeds up to 1200 AC but here is the kicker.  It only has a wired 10/100 card so that means that it will only go to the max of 100 per second and not the true source speed.  One system has to be hardwired in as the main to feed the rest of the mesh network.  Here is how I remedied that though.   I purchased one m9 plus and used it as the main.  It has a  dual 10/100/1000 lan card and is able to produce wireless speeds in excess to 2200 mbps Which means it can feed the speed from the lan to the wireless network.  And since it is wireless it bypasses the deco 2400 Lan card deficiency and give you the speeds you need through all of your deco devices.